Take a virtual ride on the world's fastest zip line.

Located in Sun City South Africa, the 918 foot high ProNutro Zip 2000 will get your heart racing as it travels 1.2 miles at 100mph. Great video!
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How to Train Like an Olympian

National Geographic asked Olympians for workout advice for weekend warriors who want to improve their endurance, power and speed. Here is the breakdown.For endurance, Rebecca Dussault, cross-country skier, gives us this workout. Jog slowly for 15 minutes as a warm-up. Then, to loosen leg muscles, sprint for ten seconds and follow with a ten-second jog. Repeat. Run at your 5K race pace for two minutes. Jog for two minutes. Repeat the two-minute speed intervals six to...
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